r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 238

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
(3)
Figures 6.23 to 6.25 show bus timings for a 16-bit, 2-state data access space. When a 16-bit access
space is accessed, the entire address bus (D15 to D0) is used for all addresses, and the upper half
(D15 to D8) of the data bus is used for even addresses and the lower half (D7 to D0) of the data
bus is used for odd addresses. Wait states cannot be inserted in the data cycle.
Rev. 1.00 Sep. 19, 2008 Page 208 of 1342
REJ09B0467-0100
Figure 6.23 Bus Timing for 16-Bit, 2-State Data Access Space (Even Address Byte Access)
Read
Write
16-Bit, 2-State Data Access Space
Notes: 1. n = 6, 7
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
2. When RDNn = 0
HWR
LWR
CSn
RD
AH
φ
Tma1
Address cycle
Address
Address
Address
Address
Tma2
T1
Data cycle
Write data
T2
Read
data